Add better support for armv7a cross compilation #2861

Job	Run time
build-extra-hackages	11s
cabal	13s
cabal-doExactConfig	9s
check-materialization-concurrency	20s
check-path-support	5s
closure-size	8s
docs	24s
hix	8m 19s
haskell-nix-roots-do-not-require-IFDs	8s
hix-cabal	8s
hydra-ifdLevel-0-and-1	5m 28s
hydra-ifdLevel-2	11m 15s
hydra-ifdLevel-3	30m 15s
hydra-without-remote-builders-ghc8107	2m 20s
hydra-without-remote-builders-ghc9101	4m 5s
maintainer-scripts	9s
multi-target	32s
nix-build	28s
nix-tools	11s
plan-extra-hackages	9s
runghc	9s
shellFor-hoogle	9s
shellFor-multiple-package	12s
shellFor-not-depends	13s
shellFor-single-package	16s
tests-benchmarks	11s
unit-tests	9s
update-docs	5s
	1h 6m 21s

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